When you ask for a reference to a method, you're asking for more than just a raw function pointer. You also need to record which object the method needs to be called upon as the object contains the data the method will work with. The best way to do this is using a closure. Assuming
$obj
is lexically scoped, you can say:

Even when
$obj
goes out of scope, the closure stored in
$mref
has captured it. Later when it's called indirectly, the correct object is used for the method call.

Be aware that the notation:

$sref = \$obj->meth;

doesn't do what you probably expected. It first calls the method on that object and gives you either a reference to the return value or a reference to the last of the return values if the method returns a list.

The
can
method from the UNIVERSAL base class, while appealing, is also unlikely to produce what you want.

$cref = $obj->can("meth");

This produces a code ref to the appropriate method (should one be found), one that carries no object information. Think of it as a raw function pointer. The information about the object is lost. That's why you need a closure to capture both the object state as well as the method to call.